51647693 has 2 divisors, whose sum is σ = 51647694. Its totient is φ = 51647692.

The previous prime is 51647669. The next prime is 51647699. The reversal of 51647693 is 39674615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50651689 + 996004 = 7117^2 + 998^2 .

It is a cyclic number.

It is not a de Polignac number, because 51647693 - 2⁸ = 51647437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51647693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51647699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25823846 + 25823847.

It is an arithmetic number, because the mean of its divisors is an integer number (25823847).

Almost surely, 2^51647693 is an apocalyptic number.

It is an amenable number.

51647693 is a deficient number, since it is larger than the sum of its proper divisors (1).

51647693 is an equidigital number, since it uses as much as digits as its factorization.

51647693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 51647693 is about 7186.6329390056. The cubic root of 51647693 is about 372.4062626169.

The spelling of 51647693 in words is "fifty-one million, six hundred forty-seven thousand, six hundred ninety-three".